feat: Add Visual Studio 2022 VC++ project for C debugging

- Create complete VS2022 solution with 3 projects:
  * V2GDecoder: Main EXI decoder with debugging support
  * HexToBinary: Hex string to binary utility
  * HexDumpToBinary: Hex dump to binary utility

- Copy all source files locally for Windows compilation:
  * Added Windows compatibility for unistd.h, fstat, S_ISREG
  * Fixed VLA issues in EncoderChannel.c with macro definitions
  * Include all required modules: codec, iso1, iso2, din, appHandshake

- Build configuration:
  * Support Debug/Release x86/x64 configurations
  * Proper include directories and preprocessor definitions
  * Windows-specific compiler flags (_WIN32, __STDC_NO_VLA__)

- Verification:
  * Both test4.exi and test5.exi decode/encode perfectly
  * 100% binary compatibility: original ↔ XML ↔ reencoded
  * Ready for step-by-step debugging in Visual Studio

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

csharp/vc2022/src/codec/EXIHeaderEncoder.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2007-2018 Siemens AG
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*******************************************************************
+ *
+ * @author Daniel.Peintner.EXT@siemens.com
+ * @version 2017-03-02 
+ * @contact Richard.Kuntschke@siemens.com
+ *
+ * <p>Code generated by EXIdizer</p>
+ * <p>Schema: V2G_CI_MsgDef.xsd</p>
+ *
+ *
+ ********************************************************************/
+
+
+
+/**
+ * \file 	EXIHeaderEncoder.h
+ * \brief 	EXI Header Encoder
+ *
+ */
+
+#ifndef EXI_HEADER_ENCODER_H
+#define EXI_HEADER_ENCODER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "EXITypes.h"
+
+
+/**
+ * \brief 		Writes EXI header
+ *
+ * \param       stream   		Output Stream
+ * \return                  	Error-Code <> 0
+ *
+ */
+int writeEXIHeader(bitstream_t* stream);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif